One question I need to know the answer to, as I'll be bringing back a small group of friends if I do come back...

If I build a castle, can my friends use the new "player search" PvP feature to attack my castle? What intrigues us is the opportunity to build castles and then bring our armies against each other's devious defense designs.

Or is the PvP mode simply some kind of open field skirmish where we each bring an army and fight it out?